Evaluate : qquad tan^(-1)(1)+cos^(-1)(-1...

Evaluate : `qquad tan^(-1)(1)+cos^(-1)(-1/2)+sin^(-1)(-1/2)`

Verified by Experts

the value of: `tan^(-1)(1)+cos^(-1)(-1/2)+sin^(-1)(-1/2)`

`=pi/4+(2pi)/3-pi/6`

`=(3pi+8pi-2pi)/12`

`=(9pi)/12`

`=(3pi)/4`

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